Roller skate



FIG. 1 is a top plan view of a design for a roller skate showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a roller skate, as shown. 